Veneer-press.



0. BERGSTRO M.

VENEER PRESS. APPLIGATIO-N r1231) HOV.-10, 1913.

1,1 16,976. Patented Nov. 10, 1914.

2 8HEETSSHEET 1.

QQQQLI THE NORRIS PETER: u,-.. FHuurLlH-IQ. WASHINGTUN D. c.

O. BERGSTROM.

VENEER. PRESS.

APPLIOAIION FILED NOV.10, 191a.

1,11 6,976. Patented Nov. 10, 19M

2 SEBBTSSHBET 2.

a W meg? 7H NORRIS PETERS CO" PHbTD-LITH K, WASHINGTON. D. L

T NITED STATE$ PA ()FFICE" OSCAR IBERGSTROM, orcrfrclico; ILLINOIS, ASSIGNOB "ro HANDY MANUFACTURING cor/martini, or CHICAGO, ILLINOIS.

To all whomit may concern:

.Be it known that I,'OsoAR citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Veneer-Presses; and I do hereby declare the following to be a full, clear, and exact description of the in vention, such as will enable others skilled in the art to which it appertains to make and use the same. l

This invention relates to improvements in screw jacksor the like, and particularly to j the screws employed inveneer presses for bringing pressure to bear upon veneer or laminated structures in the process of manu facture.

provide means wherebythe screw may be quickly adjusted to ther position approximating that in which it 1s to be finally disposed and thereby effecting economy of time and labor.

press for which the structure is particularly adapted, it being understood, "of course, that the same may be embodied in screw acks or similar structures employing screw-shafts without departing from theinvent on. I

In said drawings: Figure -1' is a fragmentary perspective view of a portion of a veneer press equipped with a screw embodying my invention. Fig. 2 1s a fragmentary view in side elevation partly in sect on showing a screw shaft and the qulck actlng split nut engaging the same, and also the support for the frame carrying sald nut. Fig. -3 is an end elevation of the frame, the same being partly broken away and parts thereof shown in sections. 1 Fig. 4a

. for the purpose of rotating the same. Fig.

-6 isa detail fragmentary plan view of the lever employed for said purpose.

In veneer presses the screw shafts operate in, exactly the opposite direction from the screw shafts of lifting jacks and the like, though obviously the principle and mode of operation is substantially identical. Inthe BERGSTROM,

the same'after' having performed their func- VENEER-PRESS.

Specification of Letters Patent. Patented N 10, Application filed November 10, 1913. Serial No. 800,167. I i

veneer press the screw shafts employedfor, compressing the veneer or the like upon the base of the press are suspended from supports joined to the base by means of a plus rality of standards and moved downwardly uponthe'load. The upper portion and base of the press are very heavy so as to enable them to be subjected to excessive separating stralnsjwlthout, deflection, but such structureslareoutside'of the scope ofmy invention which has for its sole object to provide means whereby thewscrew. shaftsmay be readilyralsed and lowered without rotating tions of maintaining the veneer under pressure and preparatoryto bringing pressure v upon fresh batch of the same. The particular object of the invention-is to As shown in the accompanying drawings, atathe upper portion 1 of an ordinary ve-' neer press are, secured two parallelchannel ed to be received; .Thescrew shaft has threaded 'engag ementwith a split-nut 5 dis posed in a carriagefi which is suspended by means of flanges 7 from the flanges 8 of the channel bars 2. .The lower end ofthe screw shaft is equipped with a rotatable bearing or presser foot 9,which is/adapted to rest upon the load supported upon the base 10 gagedwith said load while the screw shaft 4; is being rotated to compress such load. Contiguous to the lower end. of the screw shaft 9 the latter isj'equipped with a pair of parallel rigid" annular flanges 11 each provided with projections. similar to the teeth of a spur gear and which are adapted to permit ready engagement with said shaft of a wrench 12, illustrated in Fig. 6' of the drawings. The upper collar 11 is fur; ther provided with projections 13 from which radial arms 14: project, the latter being adapted tobe manually engaged for the purpose of preliminarily causing thepresser foot 9 of the screw tobear upon the load to bev subjected to pressure, the final pressure being applied by rotating said screw by means ofsaid wrench 12. v j I The wrenchlZ consists of a fiat barof metal having a bifurcated end portion in which the hubcarrying the flanges 11 is adapted to be received and engaged. ,Outwardly of said ,bifurcated end portion 15 the said bar is provided with two L shaped bars 2 between which is an open space '3 in, .which the shank of a screw, shaft 4:, isadapta of they press 'andremain nonrotatably en projections 16 disposed on opposite faces thereof and through the outer parallel arms of which a pin or shaft 17 passes, the latter passing also through the bar 12. Said pin or shaft 16 is adapted to engage in the recesses between contiguous teeth of said flanges 11 whereupon said bar or wrench may be employed to rotate the screw shaft 4t as will be obvious.

The carriage 6 comprises an upper flat wall 18 carrying said flanges 7 hereinbefore referred to, and which is provided with parallel vertical flanges 19 and 20, from the lower ends of which a sleeve 21 is sus pended, the latter being equipped with a plurality of arms 22 secured at their outer ends to the lower edges of the flanges 19 and 20 by means of the machine screws 23.

Integral withthe wall 18v and disposed above the same is a sleeve 24: axially alined with said sleeve 21, the split nut 5 being disposed between said sleeve 21 and the wall 18 and thereby held against appreciable lon gitudinal movement relatively to the car-f riage 6. In said wall 18 below said sleeve 24 and in alinement therewith there is provided an elliptical opening 25 in which the upper contracted end portions of the members of said split nut 5 are adapted to move toward and away from each other to engage and release the screw-shaft 4. The latter passes freely through the sleeves 21 and 24: which, while permitting longitudinal movement of the screw shaft t, serve to prevent lateral movement of the same, One of said members of said split nut 5 is'pro vided between its ends with an internally threaded flange 26 in. which the left-hand threaded portion 27 of a right and left threaded screw 28 engages, the latter be ing rotatably engaged with the flange 20 of the carriage or housing 6 through which it passes and being equipped at its outer end with a crank arm 29 for manually rotating the same. By means of the head 30 rigidly mounted on the outer end of said screw 28 and a collar 31 engaging the outer and inner faces respectively, of the flange 20 said shaft 28 is held against longitudinal movement relatively to said flange 20. Rigidly mountedin the other member of said screw shaft 5 are two parallel guide rods 32 passing freely through openings in the flanges l9 and 20 and also freely through openings in the first-named member of said split nut 5. Rigid with said rod between the flange 20 and the contiguous member of the split nut 5 is a yoke 33 having a threaded opening in which the right-hand threads of said screw 28 engage, said yoke 33 being keyed to said rod 32'by means of the pin 34.

The operation of the device is as follows: WVhen it is desired to move the screw shaft 4: to raise or lower the same the screw 28 is rotated in a direction to cause the yoke 33 to moveaway from the flange 20. Rotation of said screw in this direction causes the opposing member of the split nut 5, with which said screw has threaded engagement, to move toward said flange 20. The movement of the yoke 33 is communicated to the farthest removed member of the split nut 5 therebyosimultaneously moving said members of said split-nut in opposite directions and thus releasing the threads thereof from engagement with the threads of said screw shaft 4. The latter is maintained in its position by means of the sleeves 21 and 24 and after said members of said split nut have thus been separated may be easily raised and lowered. When raised one of the arms 14 is engaged with a hook 35 suspended from the sleeve 21 and thus said screw-shaft is supported by said hook when raised to substantially the'upper limit of its move ment. This is the position which the screwshaft will normally occupy after being released from engagement with oneload and preparatory to being engaged with the next succeeding load. After the next load has been mounted upon the base of the press the screw shaft is lowered by releasing the arm 14c from engagement with the hook 35 and usually said screwshaft is then permitted to move downwardly until its presser foot 9 I rests upon the top of the load in the press.

The shaft 28 is then again'rotated in the opposite direction from that previously referred to by means of the crank arm 29 thereby moving the members of the split-nut .5 toward each other and bringing the threads thereof into engagement with the threads of the screw-shaft. This having been accomplished the screw-shaft may be turned manually by means of the arms 14: until the pressure exerted upon the load is greater than can'be overcome by this manual operation. For further increasing the pressure on the load the wrench 12 is employed. The foregoing operation is repeated after each load has been held under pres-, sure in the veneer press for the required period of time.

By means of my invention the operation of the press is rendered rapid compared to the present operation thereof. It enables all of the screws to be quickly lowered into position and manually operated to bring primary light pressure to bear on the load thus leaving .a minimum of operation with the wrench 12 to be subsequently performed.

I claim as my invention:

'1. In a veneer press or the like, pressureactuating mechanism comprising a screw, 9. split nut for engaging said screw, a pair of horizontally disposed guides carrying both members of the said split nut, the said guides rigid with respect to one member of the said split nut and slidable with respect to the other thereof, a supporting member housing the said nut and supporting the said guides, a member rigid with said guides, a right and left screw engaging the said member and one member of the said nut and swiveled upon the said supporting member whereby to simultaneously move the nut members in opposite directions with respect to the first-named screw and the said supporting member.

,2. In a veneer press or the like, pressureactuating mechanism including a screwshaft, a split-nut adapted to engage the same, a housing for said nut, axially alined sleeves on said housing receiving said screw-shaft and permitting free longitudinal movement thereof, said nut disposed between said sleeves, a guide rod longitudinally movable in said housing in a direction perpendicular to the axis of said sleeves and rigidly engaged with one member of said split nut and slidably engaged with the other member thereof, a right and left threaded screw having swiveled engagement with said housing and at its inner end having threaded engagement with the other member of said split-nut, and a member rigid with said guide rod and having threaded engagement with the said screw, the respective right and left threads of the latter engaging the respective parts for simultaneously moving the same in op posite directions and relatively to the housing.

3. In a veneer press or the like, pressureactuating mechanism comprising a housing having smooth bore guide sleevesaxially alined, a screw-shaft passing freely through said sleeves, a splitnut in said housing between said sleeves engaging said screw-shaft, and means including a right and left threaded screw engaged with said housingand the respective members of said split nut for simultaneously moving the latter in opposite directions relatively to each other and to the housing, thereby bringing the said split-nut into or out of engagement with the said screw-shaft according as the said screw is rotated in one or the other direction.

4. In a veneer press or the like, pressure- Copies of this patent may be obtained for five cents each. by addressing. the

Washington. ILQ

actuating mechanism including a housing, e a sorew shaft passing freely through smooth bore openings in opposite walls of said housing, a split-nut within's'aid hous: ing engaged therein for preventing axial movement thereof relatively to the same,

said nut engaging said screw-shaft,a right and left threaded screw having swiveled engagement with said housing, and operative connection between the respectively right and left threaded portions of said screw and the respective members of said split nut for simultaneously moving the latter in opposite directions relatively to said housing as said screw is rotated.

5. In a veneer press or the hke, the comblnation with a carriage, a screw passing slidably therethrougln' and a separable split-nut housed in said carriage and adapted to be thrown into and out of engaging relation to said screw, of a projection on the latter affording a handle for manually rotating the screw when the said split-nut is in engagement therewith, and means on said carriage adapted to engage saidprojection to support said screw when said split-nut is thrown out of engagement therewith. 1

6. In a veneer press or the like, the combination with a carriage, a screw passing therethrough, and a separable split-nut housed in said carriage and adapted tobe thrown into and out of engaging relation to said screw, of a laterally projecting arm on said screw contiguous toone end thereof, and a hook on said carriage adapted to engage said arm to support said screw when said split-nut is thrown out of engagement therewith, the said arm affording a handle for manually rotating the screw when the said split-nut is in engagement therewith.

In testimony whereof I have signed my name in presence of two subscribing witnesses. I

OSCAR BERGSTROM.

" \Vitnesses M. M. BOYLE,

H. L. HALE.

Commissioner of ratents, 

